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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.util.concurrent;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.concurrent.Callable;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.concurrent.Executor;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.concurrent.FutureTask;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import javax.annotation.Nullable;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * A {@link FutureTask} that also implements the {@link ListenableFuture}<a name="line.26"></a>
<span class="sourceLineNo">027</span> * interface.  Unlike {@code FutureTask}, {@code ListenableFutureTask} does not<a name="line.27"></a>
<span class="sourceLineNo">028</span> * provide an overrideable {@link FutureTask#done() done()} method.  For similar<a name="line.28"></a>
<span class="sourceLineNo">029</span> * functionality, call {@link #addListener}.<a name="line.29"></a>
<span class="sourceLineNo">030</span> * <a name="line.30"></a>
<span class="sourceLineNo">031</span> * &lt;p&gt;<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * @author Sven Mawson<a name="line.33"></a>
<span class="sourceLineNo">034</span> * @since 1.0<a name="line.34"></a>
<span class="sourceLineNo">035</span> */<a name="line.35"></a>
<span class="sourceLineNo">036</span>public class ListenableFutureTask&lt;V&gt; extends FutureTask&lt;V&gt;<a name="line.36"></a>
<span class="sourceLineNo">037</span>    implements ListenableFuture&lt;V&gt; {<a name="line.37"></a>
<span class="sourceLineNo">038</span>  // TODO(cpovirk): explore ways of making ListenableFutureTask final. There are<a name="line.38"></a>
<span class="sourceLineNo">039</span>  // some valid reasons such as BoundedQueueExecutorService to allow extends but it<a name="line.39"></a>
<span class="sourceLineNo">040</span>  // would be nice to make it final to avoid unintended usage.<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>  // The execution list to hold our listeners.<a name="line.42"></a>
<span class="sourceLineNo">043</span>  private final ExecutionList executionList = new ExecutionList();<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>  /**<a name="line.45"></a>
<span class="sourceLineNo">046</span>   * Creates a {@code ListenableFutureTask} that will upon running, execute the<a name="line.46"></a>
<span class="sourceLineNo">047</span>   * given {@code Callable}.<a name="line.47"></a>
<span class="sourceLineNo">048</span>   *<a name="line.48"></a>
<span class="sourceLineNo">049</span>   * @param callable the callable task<a name="line.49"></a>
<span class="sourceLineNo">050</span>   * @since 10.0<a name="line.50"></a>
<span class="sourceLineNo">051</span>   */<a name="line.51"></a>
<span class="sourceLineNo">052</span>  public static &lt;V&gt; ListenableFutureTask&lt;V&gt; create(Callable&lt;V&gt; callable) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>    return new ListenableFutureTask&lt;V&gt;(callable);<a name="line.53"></a>
<span class="sourceLineNo">054</span>  }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>  /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>   * Creates a {@code ListenableFutureTask} that will upon running, execute the<a name="line.57"></a>
<span class="sourceLineNo">058</span>   * given {@code Runnable}, and arrange that {@code get} will return the<a name="line.58"></a>
<span class="sourceLineNo">059</span>   * given result on successful completion.<a name="line.59"></a>
<span class="sourceLineNo">060</span>   *<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * @param runnable the runnable task<a name="line.61"></a>
<span class="sourceLineNo">062</span>   * @param result the result to return on successful completion. If you don't<a name="line.62"></a>
<span class="sourceLineNo">063</span>   *     need a particular result, consider using constructions of the form:<a name="line.63"></a>
<span class="sourceLineNo">064</span>   *     {@code ListenableFuture&lt;?&gt; f = ListenableFutureTask.create(runnable,<a name="line.64"></a>
<span class="sourceLineNo">065</span>   *     null)}<a name="line.65"></a>
<span class="sourceLineNo">066</span>   * @since 10.0<a name="line.66"></a>
<span class="sourceLineNo">067</span>   */<a name="line.67"></a>
<span class="sourceLineNo">068</span>  public static &lt;V&gt; ListenableFutureTask&lt;V&gt; create(<a name="line.68"></a>
<span class="sourceLineNo">069</span>      Runnable runnable, @Nullable V result) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>    return new ListenableFutureTask&lt;V&gt;(runnable, result);<a name="line.70"></a>
<span class="sourceLineNo">071</span>  }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>  ListenableFutureTask(Callable&lt;V&gt; callable) {<a name="line.73"></a>
<span class="sourceLineNo">074</span>    super(callable);<a name="line.74"></a>
<span class="sourceLineNo">075</span>  }<a name="line.75"></a>
<span class="sourceLineNo">076</span><a name="line.76"></a>
<span class="sourceLineNo">077</span>  ListenableFutureTask(Runnable runnable, @Nullable V result) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>    super(runnable, result);<a name="line.78"></a>
<span class="sourceLineNo">079</span>  }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>  @Override<a name="line.81"></a>
<span class="sourceLineNo">082</span>  public void addListener(Runnable listener, Executor exec) {<a name="line.82"></a>
<span class="sourceLineNo">083</span>    executionList.add(listener, exec);<a name="line.83"></a>
<span class="sourceLineNo">084</span>  }<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>  /**<a name="line.86"></a>
<span class="sourceLineNo">087</span>   * Internal implementation detail used to invoke the listeners.<a name="line.87"></a>
<span class="sourceLineNo">088</span>   */<a name="line.88"></a>
<span class="sourceLineNo">089</span>  @Override<a name="line.89"></a>
<span class="sourceLineNo">090</span>  protected void done() {<a name="line.90"></a>
<span class="sourceLineNo">091</span>    executionList.execute();<a name="line.91"></a>
<span class="sourceLineNo">092</span>  }<a name="line.92"></a>
<span class="sourceLineNo">093</span>}<a name="line.93"></a>




























































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